No cause for alarm... that your salary is months late with zero communication. Note that he didn't say who he was referring to; Mr Fat Ass. Why should he be alarmed when you keep strolling in FOR FREE.
Then, when push comes to shove, the (grossly late) quaint email to explain it all away (but not even bother to suggest being paid timely) and you'll keep flying airplanes.
Throw a bit money out now, and they can go three or four months next time. You'll work !!!